Agreement additional extension term.

No definition available.

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Namespace Prefix:	chci_
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Balance Type:	na
Period Type:	duration

- Definition

Agreement extended termination date.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Agreement notice period required for non renewal.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Agreement original termination date.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Leasing fee per square foot for new leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Leasing fee per square foot for renewal leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of installments of fee payment.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction aggregate fee payable.

+ References

No definition available.

+ Details

Name:	chci_RelatedPartyTransactionAggregateFeePayable
Namespace Prefix:	chci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Related party transaction fee payable in installments.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Related party transaction frequency of periodic payment.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction maximum percentage of purchase price of acquired asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction percentage of all costs associated with portfolio projects in development.

+ References

No definition available.

+ Details

Name:	chci_RelatedPartyTransactionPercentageOfAllCostsAssociatedWithPortfolioProjectsInDevelopment
Namespace Prefix:	chci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction percentage of cash flow from real estate assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction percentage of portfolio revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction percentage of raised capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction percentage of sales price of asset on disposition.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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Subsequent Events - Additional Information (Detail)	Apr. 30, 2019 USD ($) Installment $ / ft²	Mar. 31, 2019 USD ($)
Comstock Asset Management, L.C. [Member]
Subsequent Event [Line Items]
Fixed annual payment		$ 1,000,000
Subsequent Event [Member] \| 2019 AMA [Member] \| CDS [Member]
Subsequent Event [Line Items]
Fixed annual payment	$ 1,000,000
Agreement extended termination date	Dec. 31, 2027
Agreement original termination date	Dec. 31, 2022
Agreement additional extension term	1 year
Agreement notice period required for non-renewal	180 days
Subsequent Event [Member] \| 2019 AMA [Member] \| Comstock Asset Management, L.C. [Member]
Subsequent Event [Line Items]
Cumulative, compounded, preferred return rate	8.00%
Leasing fee per square foot for new leases \| $ / ft²	1.00
Leasing fee per square foot for renewal leases \| $ / ft²	0.50
Subsequent Event [Member] \| Business Management Agreement [Member] \| Investors X [Member]
Subsequent Event [Line Items]
Aggregate fee payable	$ 937,500
Number of installments of fee payment \| Installment	15
Aggregate fee payable, frequency of periodic payment	quarterly
Fee payable in installments	$ 62,500
Subsequent Event [Member] \| Asset Management Fee [Member] \| 2019 AMA [Member] \| CDS [Member]
Subsequent Event [Line Items]
Percentage of CRE portfolio revenues	2.50%
Subsequent Event [Member] \| Construction Management Fee [Member] \| 2019 AMA [Member] \| CDS [Member]
Subsequent Event [Line Items]
Percentage of all costs associated with portfolio projects in development	4.00%
Subsequent Event [Member] \| Property Management Fee [Member] \| 2019 AMA [Member] \| CDS [Member]
Subsequent Event [Line Items]
Percentage of CRE portfolio revenues	1.00%
Subsequent Event [Member] \| Acquisition Fee [Member] \| 2019 AMA [Member] \| CDS [Member]
Subsequent Event [Line Items]
Maximum percentage of purchase price of an acquired asset	0.50%
Subsequent Event [Member] \| Disposition Fee [Member] \| 2019 AMA [Member] \| CDS [Member]
Subsequent Event [Line Items]
Percentage sales price of an asset on disposition	0.50%
Subsequent Event [Member] \| Incentive Fee [Member] \| 2019 AMA [Member] \| Comstock Asset Management, L.C. [Member]
Subsequent Event [Line Items]
Percentage of free cash flow from real estate assets	10.00%
Subsequent Event [Member] \| Investment Origination Fee [Member] \| 2019 AMA [Member] \| Comstock Asset Management, L.C. [Member]
Subsequent Event [Line Items]
Percentage of raised capital	1.00%